package com.yu.designpatterns.singleton;

/**
 * 饿汉式
 *
 * 类加载到内存后，就实例一个单例，JVM保证线程安全
 * 简单易用，推荐使用！
 * 唯一缺点：不管用到与否，类加载时直接完成实例化
 */

public class Mgr01 {

    private static final Mgr01 INSTANCE = new Mgr01();

    private Mgr01(){}

    public static Mgr01 getInstance(){
        return INSTANCE;
    }

    public void m(){
        System.out.println("m");
    }

    public static void main(String[] args) {
        Mgr01 m1 = Mgr01.getInstance();
        Mgr01 m2 = Mgr01.getInstance();
        System.out.println(m1 == m2);
    }

}
